dc.contributor.author |
Schultheis, M |
|
dc.contributor.author |
Parthasarathy, M |
|
dc.contributor.author |
Omont, A |
|
dc.contributor.author |
Cohen, M |
|
dc.contributor.author |
Ganesh, S |
|
dc.contributor.author |
Sevre, F |
|
dc.contributor.author |
Simon, G |
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dc.date.accessioned |
2008-07-22T11:53:19Z |
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dc.date.available |
2008-07-22T11:53:19Z |
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dc.date.issued |
2002-05 |
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dc.identifier.citation |
Astronomy and Astrophysics, Vol. 386, No. 3, pp. 899 - 909 |
en |
dc.identifier.issn |
0004-6361 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/2828 |
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dc.description.abstract |
An analysis of low resolution spectra and infrared data of 29 ISOGAL-DENIS sources with mid-IR excess is presented. Eight ISOGAL sources from our sample with 7-15 mu m excesses are found to be B and A-type stars, some of them with emission lines. Two ISOGAL sources, J175614.4-240831 (B3-4IIIe) and J173845.3-312403 (B7IIIe), show a bump between 5000 and 6000 Å which may be attributed to extended red emission (ERE). Some of the B, A and F-type giants with a large infrared excess might be in the post-AGB phase. For about 50% of the sources in this preliminary study, a nearby second (or even multiple) component was found. Such sources, in particular two B-stars, are not discussed when the probability of the optical spectrum being associated with the ISOGAL source is low. These results confirm that the DENIS-ISOGAL I-J/K-[15] diagram is the most suitable diagram to distinguish between early (AB) and late spectral types (KM). It provides the most useful tool to systematically search for nearby early-type stars with an infrared excess among the background of distant AGB stars in ISOGAL fields of the Galactic disk. This is paper No. 9 in a refereed journal based on data from the ISOGAL project. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA. Based on observations collected at the European Southern Observatory, La Silla Chile (63.L-0319). |
en |
dc.format.extent |
543206 bytes |
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dc.format.mimetype |
application/pdf |
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dc.language.iso |
en |
en |
dc.publisher |
E D P Sciences |
en |
dc.relation.uri |
http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2002/18/aah3088/aah3088.html |
en |
dc.subject |
Stars: AGB And Post-AGB |
en |
dc.subject |
Stars: Early-Type |
en |
dc.subject |
Galaxy: Solar Neighbourhood |
en |
dc.subject |
ISM: Reflection Nebulae |
en |
dc.subject |
ISM: Dust, Extinction |
en |
dc.title |
Low resolution spectroscopy of ISOGAL sources: Search for early-type stars with infrared excess |
en |
dc.type |
Article |
en |